Cutter-grinding machine.



A. R. MURRAY. l CUTTER GHINDING MACHINE.

APPLICATION FILED SEPT.23 1914.

SHEET l.

Patented Aug. 3

3 SHEETS- WWA/55 JAM., 2

A. R. MURRAY.

CUTTER GRINDING MACHINE.

APPLICATION FILED sEPLzs. I9I4.

.0. 1 0J 1 Qu.. w. u A d e t n Q t na 3 SHEETS-SHEET 2.

.IJHI XMIIVIIIIT. -IIIII Il lvo LIJVIIAUIL A. R. MURRAY.

CUTTER GRINDING MACHINE.

APPLlcATloN FILED sanza. 1914.

L; I Pntntedmlg. 3, 1.915.

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ARISTIDES R. MURRAY, OF CE'CINNATI, OHIO, ASSIGNR TO'TI-IE CINCINNTI GEAR CUTTING MACHINE COMPANY, OF CINCINNATI, Dfi-110, A CORPORATION OF OHIO.

CUTTER-GrRNDING IVIACHINIELy messes.

Speccation of Letters Patent.

rarentea aude, reis appueauon sied september 23, 1914. semaine. 863,116.

To all fui/rom t 77mg/ concern l Be it known that I, Anrsrmns R., MURRAY, a citizen of the United States, residing at ACincinnati, in the county of VHamilton and State of Ohio, have invented certain new and useful Improvements 1n Cutter-Grinding Machines, of whichthe following is av vide means whereby the median lines of therv cutting-faces of the teeth of cutters shall be maintained substantially radial of the cutter in grinding so that the cutting-faces at each side of said median lines shall retreat equally for maintaining the contours of the cutting-edges of the teeth, whether said cuttingedges be plain, that is, parallel to the axis of rotation of the cutter, or staggered, that is alternately sloping in different .di-

rections with relation to said axis, it being understood that such cutters are usually of the -solid type and have relieved cuttingteeth. A

1t is a further object of my invention to provide novel means for presenting the cutter being ground atvarious angles to the grinding-wheel; and, further, to provide novel means for lcontrolling the positions of the cutter and its teeth during the grinding operation.

The invention will be further readily understood 'trom the following descriptionand claims, and from the drawings, in which latter: ,n

Figure 1 is a plan view of a cutter grind machine exemplifying my invention. is a front elevation of the saine, partly ien away. Fig. 3 isa side elevation of vertical cross-section taken on the line -l-i of F ig. 1, showing the manner of mounting parallelism with the same, partly broken away. Fig. i is a,

vation. Fig.l 5 is a detail in section on the line 5 5 of Fig. 1.` Fig. 6 is a cross-section on the line 6 6 of Fig. 1," showing the manner of mounting the cutter-yoke. Fig. 7 is a plan view showing the gage in use for adjusting the cutter-supporting bracket laterally with relation to the grinding-face of the grinding-wheel. Fig8 isa plan View showing' a hobbing cutter in position and in relation for having one of its series of cutting faces ground'by the grinding-Wheel;

and, Fig. 9 is an inside end view of the same.

The means for mounting and reciprocating the `cutter-slide and the means for mounting and driving the grinding-Wheel, herein shown and described, are in the main the'same as shown, described and claimed in my application for Letters Patent on improvements in ,cutter grinding machines, filed November 7, 1913, Serial No, 799,747.

11 represents the frame of the machine on which there is a refuse-pan 12. A grinding-wheel shaft 13 is journaled in bearings 14 of a hollowpilloW 15 in the refuse-pan.

The shaft 13 has a pulley 16 thereon for receiving a suitable belt passing through the hollow of the pillow about the pulley.

grinding-wheel 17 is suitably releasably secured to the shaft 13, as by means of a nut 18. The grinding-Wheel is showri as a cupshaped wheel, the grinding-face 19 of the wheel being at the outer end of the cup- -wall thereof and extending in a plane at `right angles to the axis of rotation of the grinding-wheel shaft. This grindingface is maintained inv its true plane if necessary by redresaing- A hood 20 is received about the upper portion` of the grinding-wheel, and is pivoted to the refusepan by a pin 21. The fiuid for the grinding-wheel is fed through a suitable spout 22, suitably secured to the hood.

23'is a cutter-support which, in the present exemplifieation, is mounted on a slide 2i and is adjustable laterally for positioning the cutter, shown at 25, laterally with relation tothe grinding-wheel. The slide exemplified comprises a slide-member 26, an apron 27 and a bracket 28. Guides 29. are provided between the slide-member and the shelf 30 of the apron. The guides are suitably secured to the slide, the shelf having guideways 3l coperatug with the guides. @ne et theguidee is previ'rled with rack-teeth 32, with which a pinion 33 on a removable adjusting stem 34 removably received in a bearing 35 in the shelf is arranged to mesh. Bolts 36 are thr aded into the slide-member as shown at 37, and extend through slots 3S in the support, nuts 39 being threaded over the outer threaded ends of said bolts for clamping the cutter-support in laterally adjusted position to the slide-member, lwashers 40 being interposed between said nuts and the shelf. The slide- 4its other end being screw-threaded, as

shown at 49, a clamp-nut 50 being threaded to said threaded end for clamping the bracket in adjusted position between tlre apron and said nut. The apron and bracket have coacting slide-faces 51. A shifter-arm 52 is provided for shifting the bracket about the shaft 45. The angular positioning of the bracket about its rocking axis raises or lowers the tooth to be presented to the grinding-wheel'for enabling the inner corners of the cutting-faces of the teeth at both sides of the usual webs between the bases of the teeth to be ground.

An extension 55 extends rearwardly from the bracket and has a back-stop 56 pivoted with relation thereto, the back-stop being arranged to contact the rear facesor backs of the teeth of the cutter for positioning the several teethl respectively with relation to the grinding-wheel, so as to insure uniformity of grinding of the cutter-teeth. The back-stop is shown pivoted by a pin 57 to a collar 58 adjustable laterally on an varm 59, whereon it is clamped in adjusted positions by a clamp-screw 60, the arm being on a slide 6l adjustable back and ortlron vthe extension 55 by means of T-bolts'62 adjustably placed in a T-slot 63 in said extension and clamped in adjusted positions by nuts 64, as more particularly described in my aforesaid application. The position of the back-stop maybe further adjusted by means of an adjusting screw 65, and is normally held in obstructing position with relation to the teeth of the cutter by means of a spring 66, the'baek-stop receding from the advancing tooth of the cutter when the cutter is turned for placing the next advancing tooth in grinding position, and snapping backinto obstructing position upon passage of said tooth, whereby the back of the tooth may be placed againstsad back-stop.

The cutterl is arranged to be moved toward and from the grinding-wheel, as by providing the slide with a rack 11, with which a segment-gear 72 meshes, the segment-gear being on a rock-shaft 73 operable by an arm T4, stops 75, 7G, controlling the limits of reciprocating movement of the slide and the cutter as more particularly shown, described and claimed in my aforesaid application.

The bracket 28 is provided with a bearing Sl in which the cutter-support is rockable. |The cutter-support is shown as provided with a journal S3 in the bearing 8]., there being a S4 between said cuttersupportan'd bearing for gaging the angularity of the adjustment between said cuti ter-support and bearing. rl`hc graduations 85 "the gage are shown on the cuttersupport and are arranged to register with a 'guide-mark 8G on the bearing. The bearing is shown as a clamp-bearing arranged to be clamped about the journal by means of' a clamp-screw 87.

The cutter-support is shown as of yoke form, being provided with. tines 8S, 89, for supporting a cutter-stem 90, which is received through the bo're 91 of the cutter to be ground, one or more bushings, one of which is shown at 92, being placed about the stem when necessary for centering the cutter about said stem. rlhe stern is so placed o'n the support that its longitudinal axis is intersected by the rocking axis of the` cutter-support.

` The parts are so arranged that when `grinding the cutting-faces of teeth of plaintooth cutters, the cutting-face of the tooth being ground will lie in .a plane parallel to the longitudinal axis of the stem coincident with the rocking axis of the support when the guide and zero marks of the gage regis-- ter with each other. This cutting-face of the tooth being ground is further caused to lie in the plane of the grinding face of the grinding-wheel by lateral adjustment of the bracket 28.

The cutter is further adjustable in directions parallel to its axis of rotation so as to adjust the same for placing the middle of the width of the cutting faces of its teeth in a plane which extends at right angles to the axis of rotation of the cutter and is coincident with the rocking axis o1 the cutter-support. Said rocking axis is in `line with the grinding-face of said grinding-wheel, when the cutter-support has been properly laterally adjusted, so that, when the cutter-support is rocked about its axis, the tooth in line with the grinding-face of said grinding-wheel is swung about the median line of its'cutting-face.

For adjusting the cutter-head up and down on-the cutter-support, I form the cutter-stem as an adjusting screw, which is j 98 of the tine 89, the bushing being pro- .jvecting toward vthe grinding-Wheel.

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vided with a lflange 99 from Whicha 100 extends into a hole 101 in the tine 89 for preventing turningfof the bushing inv its bearing and insuring, that when the adjusting screw is turned, axial movement of the bushing 97 will take place for raising or lowering the cutter'received about the adjusting screw. Washers 102 may be received in suitable numberfabout the stemv under. the cutter for proximate positioning 'of the cutter. v l

In order to gage the parts into positions for `accomplishing the purposes stated, I provide a gage 105, shovvn as a rod -having a straight-face 106 at one end Which is coincident With the longitudinal axis of the rod,land a recess 107 at its other end havy ing oppositely sloping Walls 108, having equal angularity at opposite sides of the longitudinal aXis of said rod. The gage is arranged `to be placed in the bearing 109 of4 the cutter-support with its longitudinal' axis coincident with the rockingv axis 'of the cutter-support. `The gage may be placed in this bearing With either of its ends progage may be first placed with its straightface projecting toward the grinding-Wheel, as indicated in Fig. 7 and With the gage 84 preferably placed at zero, althou h this latteris not essential. rIhe apron 2 is ad-A justed laterally on the slide-member 26, so that the straight-face 106, which has been previously placed in range with the grind-` ing-Wheel, Will make contact With the grinding-face 19 of said grinding-Wheel, thereby positioning the longitudinal axis of the bearings for the cutter-stem in the plane of the 'grinding-face, the cutter-stem itself having been previously removed for permitting the rod 105 to pass the position` normally occupied by said cutter-stem.

rIhe cutter and cutter-stern having been positioned on the cutter-support, and the gage Sifbeing placed at Zero,the cutter having teeth provided with cutting-faces which extrnd parallel to its axis of rotation will be so located, that the cutting-face of its tooth nearest the grinding-Wheel is parallel to the plane of the grinding-face thereof, the backstop having been properly adjusted. Upon reciprocation of the Acutter-support toward and from the grinding-Wheel, the tooth will be properly ground by the grinding-Wheel, the teeth of the cutter being successively operated upon.

1i it is desired to grind the teeth of a cutter having sii-called staggeredteeth, enterre7 This plied bythe cutter 25 (Figs. 8 and 9), the cutter havingbeen placed on the stem andthe stem having been mounted onthe cuttersupport with sufficient Washers 102 underthe cutter to approximately' position the middle of the cutting-face of the cutter in line with the rocking axis of the cutter-'support, the gage 105 is placed in the bearing 109, With the recess 107-tovvard the cutter, as exempliied by the position of the gage in Fig. 6. The cutter-stem 90 is now turned for raising the cutter to such position, so

vthat the kgage 105 can be pushed toward the cutter with equal contactof each of said sloping walls 108 With opposite sides of the teeth of the cutter. When such equal co'ntact is had, the cutter Will have been adjusted, so that the median` line ofthe cuttingiface of the tooth presented to `the grindingy Wheel will be coincident With the axis upon which the cutter-support turns. A

The clamp-screw 87 is released for releasing the clamp-bearing 81, and the cuttersupport is turnedA sothat the graduation at one side of the zero mark, which corresponds to the desired 'degree of angularity of the cutting-face of thetooth to be ground, Will When the teeth having their cuttingl faces l extending in similarI directions have been ground, the clamp-bearing 81 is again uniso clamped, and the cutter-support turned for bringing its corresponding graduation at the opposite side of the zero mark in registry with the 'guidemark 86, and the clampbearing again clamped in place, whereby the teeth having their cutting-faces extending in the opposite direction will, when they are brought into juxtaposition With the grinding-face of the grinding-Wheel, extend in the plane of said grinding-face with the median line of the cutting-face in line with the rocking axis of the cutter-support. j

My improved device .insures accurate grinding of the cutters, Whether having cutting-faces which are plain or staggered, and provides a compact construction readily manipulated for accurately placing the cutters with their teeth in proper positions to be ground.

I- Iavingthus fully described my-invention,

What I claim as new and desire to'secure by Letters Patent', is:

- 1. In a cutter grinder, the combination bf l said cutter-support rotatively adjustable on an axis intersecting said cutter axis and parallel to the plane of saidgrinding-aee.

2. 4In a grinding machine, the combination of a grinding-wheel having an end grinding-face, a cutter-sup port having a cut- ,cutter-support having a cutter axis adjustable about an' axis intersecting said cutter axis and located in the plane of said grinding-face when the cutter is in grinding position, adjusting means for adjusting the cutter lengthwise of said cutter axis, and adjusting means for adjusting said second named axis toward and from the plane of said grinding-face. i l

4. In a cutter grin iler, the combination with a grinding-wheel.having an end grinding-face, a cutter-support having a cuttersupporting stem, means for adjusting said cutter-support laterally with relation to said grinding-face, means for rotatively adjusting said cutter-support on an axis lying across said grinding-face, a gage provided with a gaging face for coacting with said grinding-face whereby to adjust the lateral. position of said support, said support provided with a guide for said gage parallel to said axis on which said cutter-support is rotatively adjusted.

5. In a cutter grinder, the combination with a grinding-wheel having an end grinding-face, a cutter-support having cuttersupporting means thereon, means for adjusting the cutterlengthwise of its axis of rotation on said cutter-supporting means, means rotatively mounting said cutter-support on an axis lying across said grinding-face and intersecting said axis of rotation when said cutter is mounted on said cutter-supporting means, a gage provided with cutter-contacting Jfaces, means for -mounting said gage on said cutter-support with said cutter-contacting faces equal distances from said secondnamed axis whereby to gage the longitudinal adjustment of the cutter on'said cutter-supporting means.

6. In a cutter grinder, the combination, with a grinding-wheel, of a cutter-support, means for causing right-line approach and recession between, said grinding-wheel and cutter-support comprising a right-line guiding support, and means for rotatively adjusting said cutter-support on 'an axis substantially parallel to said right-line approach and recession and substantially perpendicular by said support to the axis of rotation ofthe cutter supported by said suport. r

' 7, In a cutter grinder, the combination,

with a grinding-wheel, ot' a cutter-support, means ior causing right-line approach and recession between said grinding-wheel and cutter-support comprising a right-line guiding-support, means Jfor rotatively adjusting said cutter-support on an axis located in a plane substantially parallel to the plane of said right-line approach and recession and substantially perpendicular to the axis of rotation of the cutter supported by said cutter-support, and means for adjusting said cutter on said cutter-support lengthwise of its axis of rotation with relation. to said axis on which said cutter-support is rotatively adjusted.

8. In a cutter grinder, the combination, with a grinding-wheel, of a cutter-support, means for causing right-line approach and recession between said grinding-wheel and cutter-support comprising a right-line guiding-support, means for rotatively adjusting said cutter-support on an axis located in a plane substantially parallel to the plane of said right-line approach and recession and substantially perpendicular to the axis of rotation of the cutter supported by said cutter-support, means for adjusting said cutter on said cutter-support lengthwise of axis of rotation with relation to said axis on which said cutter-support is rotatively adjusted, and a'gage provided with cutter-contacting faces equal distances from said axis on which said cutter-support is rotatively adjusted whereby to gage said adjustment of said cutter lengthwise of its axis of rotation.

9. In a cutter grinder, the combination of a refuse-pan, a grinding-wheel rotatable therein, a cutter-support in said refuse-pan, means for causing right-line approach and recession between said grinding-wheel and cutter-support comprising a right-line guidingsupport outside the refuse containing walls of said refuse-pan, and means for rotatively adjusting said cutter-support on an axis located in a plane substantially parallel to the planev of said right-line approach and recession and substantially perpendicular to the axis of rotation of the cutter supported by said support. f

l0. In a cutter grinder, the combination of a refuse-pan, a grinding-wheel rotatable therein, a' cutter-support in said refuse-pan, means for causing right-line approach and recession between said grimling-wlieel and cutter-support comprising a right-line guiding support outside the refusecontaining walls of said refuse-pan` means for rotatively adjusting said cutter-support on an axis located in a plane substantially pai'- all'el'to the plane of said right-line apprcachland recession and substantially perpendicular to the axis of rotation of the cutter supported by said cutter-support7 and means for adjusting said cutter on said cutter-support lengthwlse of its axis of rotation with relation to said axis on which said cutter-support is rotatively adjusted.

11. In a cutter grinder', the combination of a grinding-wheel, a bracket extending substantially parallel to the axis of rotation of said grinding-wheel, means forrotatively adjusting said bracket on an axis substantially parallel to said axis ot' rotation, a bearing on said bracket, a cutter-support journaled for adjustment in said bearing on an axis at substantial right angles to said iirst-named axis, means for causing end- -wise adjustment between said bracket and grinding-wheel, means for adjusting the cutter lengthwise of its axis of rotation on said cutter-support, said cutter-support provided with a gage having contact-faces for the cutter which recede equally inopposite directions from that plane parallel to the side -itaces of said cutter in which said jourj nal axis of said cutter-support is located for determining said adjustments of said' gles to said first-named axis, said yoke provided with a pair of' tines between which the cutter is arranged to be received, a cuttersupporting stem journaled iii one of said tines, and a bushing having sliding movement lengthwise oi' said stem in the other of said tines, said bushing arranged to support the cutter, and said stem having threaded connection with said bushing whereby to adjust said cutter in said yoke lengthwise of its axis of rotation.

13. In a cutter grinder, the combination of a grinding-wheel having an end grindingface, a bracket extending substantially parallel to the axis of rotation of said grindingwheel, means for rotatively adjusting said bracket on an axis substantially parallel to said axis of rotation, a bearing on said bracket, a cutter-support journaledfor adjustment in said bearing on an axis at substantial right angles to said first-named` axis, means for causing endwise adjustment between said bracket andv grinding-wheel,

, said cutter-support having a straight-face gage thereon arranged for presenting said straight-face parallel to said grinding-face throughout the various rotative adjustments of said cutter-support for determining the endwise adjustments between said bracket Uopes of this patent may be obtained tor ve cents each, by addressing the a a..

Washington, D. tl."

and grinding-wheel, and means for causing approach andrecession between said grinding-wheel and bracket.

14. In a cutter grinder, the combination of a grinding-wheel having an end grind.

ing-face, a bracket extending substantially parallel to the axis of rotation of said grinding-wheel, means for rotatively adjusting said bracket on an axis substantially parallel to said axis of rotation, a bearing on said bracket, a cutter-support journaled for adjustment in said bearing on an axis at substantial right angles to said Afirstnamed axis, means for causing endwise ad- .justment between said bracket and grinding-wheel, means'for adjusting the cutter lengthwise of its axis of rotation on said cutter-support, a gage on said cutter-support provided with a straight-face at one end thereof for coactionwith said grindingface for determining the endwise adjustments between said bracket and grindingwheel 'with oppositely receding contactfaces at the other end thereof for determining said adjustments of said cutter lengthwise of its axis oi rotation, vano .l ans for causing approach and recession .etween said'grinding-wheel and bracket.

15. In a cutter grinder, the combination of a grinding-wheel having er end grinding-face, a cutter-support, means for causing adjustment between said grinding u heel and cutter-support lengthwise of the axis of rotation of said grinding-wheel, means for rotatively adjusting said cutter-support on an axis parallel to said grinding-face, means on said cutter-support for adjusting the cutter thereon lengthwise of its axis of rotation, and a gage on said support provided l with a straight-face arranged to coact with said grinding-face for `determining said first-named adjustment and with opposed contact-faces for the .cutter spaced equally from said axis-on which said cutter-support is rotatively'adjusted for determining the adjustment of said cutter lengthwise of itsaxis of rotation.

16. In a cutter-grinder, the combination with a grinding-wheel, of a cutter-support having a cutter axis, said cutter-support rotatively adjustable'on an axis intersecting said cutter axis in the plane of' and lying across 4the grinding-face of said grindingwheel when the cutter on said cuttersupport is in grinding position.

In testimony whereof, I have hereunto signed my name in the presence of two subscribmg witnesses.

ABISTIDES R. MURRAY.

amener or Patente, 

